<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title></title>
    <style>
        #box {
            width: 200px;
            height: 200px;
            border: 5px solid #f00;
            overflow: hidden;
            position: relative;
        }

        #box div {
            width: 300px;
            height: 300px;
            background: green;
            position: relative;
        }
    </style>
</head>
<body>
<!--
    IE67下子级有相对定位，并且宽高比父级要大。那父级overflow:hidden;后是包不住它的
    解决办法
        给父级也加相对定位
-->
<div id="box">
    <div></div>
</div>
</body>
</html>
